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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'faa35d520fbf2ec5aa305acacb7a5c2ef2c31df6af6885fd727ec7609549cb89' 
  AND token = '8xGPHe5kOGbipcV+R2YWTI/sDAXp6SbI2u6sBlnh+sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}